Seismic performance improvement of liquid storage tank using new type three-dimensional base-isolation

Ensuring the normal operation of liquid storage tanks after the earthquakes is of great significance, but the probability of seismic damage of the non-isolated liquid storage tanks is relatively high. In order to improve the seismic performance of liquid storage tanks, a new type of three-dimensional isolation suitable for the liquid storage tanks is obtained through improvement. Considering the material nonlinearity, the liquid-solid coupling, and the liquid sloshing characteristics, a refined calculation model of the new type three-dimensional isolated liquid storage tanks is established. The damping effects of the new type of three-dimensional isolation, the ordinary three-dimensional isolation and the lead rubber isolation are compared and analyzed. The dynamic responses of the liquid storage tank under the action of different types of seismic waves is discussed. Finally, the parameter influence analysis is conducted. The results show that the control effect of the new type three-dimensional isolation on the liquid sloshing wave height is significantly better than that of the ordinary three-dimensional isolation and the lead rubber isolation. Moreover, the new three-dimensional isolation has a remarkable effect on vertical earthquake control. The dynamic responses of the tank wall under the action of the near-field pulse-like seismic waves is larger, and the damping effect of the new type three-dimensional isolation is more significant. As the friction coefficient of the new type three-dimensional isolation increases, the damping effect becomes weaker, and as the liquid storage height increases, the damping effect of the new type three-dimensional isolation becomes more significant.